Generally "Truly" random passwords are better than any other methods. Also the longer a password is the better.

Password Quality must strike a balance between maximizing security and maximizing Usability. Generally results indicate that, as might be expected, increases in Password Quality (ie entropy) often correlate with a decreases in usability.[1]

A common piece of password advice is to substitute characters, such as numbers or special characters, for letters. For example, password becomes p@$$w0rd. These are sometimes called "leetspeak" passwords, because "elite" hackers originally used such character substitutions. However, these are easily defeated by Password Guessing Attacks which use Heuristic Attacks